onsemi MMBTA42LT

MMBTA42LT variants from onsemi

MMBTA42LT Datasheet

Variants

Mfr

onsemi

Lifecycle

Active

MMBTA42LT Overview

What changes between part numbers, and what to check before you lock the BOM — BJTs.

Key Features

Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
2 distinct suffix patternsExamples: 1G, 3G. Decode suffix meaning in the ordering notes under the variant table.

Target Applications

BJTs — design-in and field replacement
BOM scrub where only the base prefix is known but suffix is TBD
Second-source checks when the original MPN is constrained

Ordering Variants

Compare 2 MMBTA42LT part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.

Part Number	Description	Manufacturer	Lifecycle	RoHS	Availability	Action
MMBTA42LT1G	300V NPN BJT Transistor, 500mA, 50MHz, SOT-23	onsemi	Active	Compliant	In Stock	RFQ
MMBTA42LT3G	NPN BJT 300V 500mA SOT-23 Transistor	onsemi	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on MMBTA42LT map to package, grade, and reel options.

How to Choose the Right MMBTA42LT BJTs

📦

Match the footprint first

Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.

⚡

Electrical headroom

Compare voltage and current columns in the variant table. For MMBTA42LT, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.

🌡️

Temp grade letter matters

Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.

🔢

Copy the full MPN

Do not BOM only "MMBTA42LT" — include the full suffix (e.g. 1G, 3G). RFQ with reel/tube preference and required date code.

Technical Specifications

Core parameters for MMBTA42LT product family

Identity

Base Model

MMBTA42LT

Manufacturer

onsemi

Listed Variants

Variant Parameters

Lifecycle Status

Active

RoHS Status

Compliant

Source MMBTA42LT with Octatronics

Request stock confirmation, lead time, date code, and pricing for all 2 ordering variants from onsemi. Our team supports active, EOL, and hard-to-find component sourcing.

Original manufacturer parts with traceability options
BOM upload and multi-line RFQ support
Package, grade, and compliance verification

Request Quote View onsemi Browse all base models →

Frequently Asked Questions

Common technical questions about the MMBTA42LT product family.

Is MMBTA42LT a single part I can order, or a family prefix?

MMBTA42LT is a base / family code from onsemi. You order a full MPN such as MMBTA42LT1G, MMBTA42LT3G. The variant table lists 2 orderable lines with different suffixes.

What do the suffix letters on MMBTA42LT part numbers mean?

Listed suffix fragments include: 1G, 3G. Typically they encode package (see Package column), temperature grade, and tape/reel option. Always decode on the onsemi datasheet ordering guide — do not guess from pattern alone.

What is the lifecycle status of MMBTA42LT variants?

Lifecycle values in our listing: Active. Status is per MPN suffix — one variant can be Active while another is NRND. Check PCN for your exact suffix before multi-year commitments.

What should I send for an RFQ on MMBTA42LT?

Full manufacturer MPN (not just MMBTA42LT), quantity, needed date code, reel vs tube, and any compliance docs (CoC, RoHS, conflict minerals). If you only know the base prefix, include a photo of the existing label or reel.

Where is the MMBTA42LT datasheet?

Use the datasheet link in the page header. Cross-check electrical curves (SOA, saturation voltage, etc.) against your operating point — the table summarizes order codes, not every graph in the PDF.